// 
// IntervalEnvironment.cs
// 
// Authors:
//	Alexander Chebaturkin (chebaturkin@gmail.com)
// 
// Copyright (C) 2012 Alexander Chebaturkin
// 
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//  
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;

using Mono.CodeContracts.Static.Lattices;

namespace Mono.CodeContracts.Static.Analysis.Numerical {
        class IntervalEnvironment<TVar, TExpr> :
                IntervalEnvironmentBase<TVar, TExpr, Interval, Rational>
                where TVar : IEquatable<TVar> {
                static IntervalAssumer<TVar, TExpr> cachedAssumer;

                public IntervalEnvironment (IExpressionDecoder<TVar, TExpr> decoder)
                        : base (decoder)
                {
                }

                IntervalEnvironment
                        (IExpressionDecoder<TVar, TExpr> decoder,
                         EnvironmentDomain<TVar, Interval> varsToInterval)
                        : base (decoder, varsToInterval)
                {
                }

                public override IntervalAssumerBase<TVar, TExpr, Interval, Rational>
                        Assumer { get { return cachedAssumer ?? (cachedAssumer = new IntervalAssumer<TVar, TExpr> ()); } }

                public override IntervalContextBase<Interval, Rational> Context { get { return IntervalContext.Instance; } }

                protected override IntervalEnvironmentBase<TVar, TExpr, Interval, Rational> NewInstance
                        (EnvironmentDomain<TVar, Interval> varsToIntervals)
                {
                        return new IntervalEnvironment<TVar, TExpr> (Decoder, varsToIntervals);
                }

                public override IntervalEnvironmentBase<TVar, TExpr, Interval, Rational> AssumeVariableIn
                        (TVar var, Interval interval)
                {
                        return RefineVariable (var, interval);
                }
        }
}